English: A quarry along the Provincial Road 228 near Sancha exposes the transition between the uppermost Doushantuo Formation (black, organic-rich shales known as 'algal coal') and the lowermost Dengying Formation made of bright, brittle dolostones
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{{Information |Description ={{en|1=A quarry along the Provincial Road 228 near Sancha exposes the transition between the uppermost Doushantuo Formation (black, organic-rich shales known as 'algal coal') and the lowermost Dengying Formation made of b...
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